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* Licensed under the Apache License, Version 2.0 (the "License");
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*
*     http://www.apache.org/licenses/LICENSE-2.0
*
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<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
</head>
<body>
<video id="video" width="500px" height="500px" autoplay></video>
<canvas id="canvas" width="500px" height="500px"></canvas>
<br>
<input type="button" title="HTML5摄像头" value="开启摄像头" onclick="getMedia()"/>
<script>
  function getMedia()
  {
    let constraints = {
      video: {width: 500, height: 500},
      audio: true
    };
    // 获取video摄像头区域
    let video = document.getElementById('video');
    // 返回的Promise对象
    let promise = navigator.mediaDevices.getUserMedia(constraints);
    // then()异步，调用MediaStream对象作为参数
    promise.then(function(MediaStream) {
      video.srcObject = MediaStream;
      video.play();
    }).catch(function(err) {
  	  console.info(err.name + ': ' + err.message);
    });
  }
</script>
</body>
</html>
